Note: If total testosterone levels are greater than the cutoff for this test (>1500), results for free testosterone and/or percent free testosterone may not be provided. If total testosterone results are expected to be >1500 it is best that the LC/MS-MS version of this test be ordered.

Patient Instructions: Patient should fast for 12-14 hours before collection of the specimen. If using a testosterone cream please be sure you have not rubbed any into the antecubital area of your arm for the last 24 hours as it can give elevated results. For accurate test results, no ejaculation during the 24 hours preceding the test. This test may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H or coenzyme R). It is recommended to stop biotin consumption at least 72 hours prior to the collection of specimen.

Estimated turnaround for results is 10-14 business days. If confirmation testing is required, the estimated time may be extended.